Method of detecting a disturbing signal for a digital data demod

Details Method of detecting a disturbing signal for a digital data demod Method of detecting a disturbing signal for a digital data demod

1992-01-30

1994-05-17

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 96, H04B 110

Patent

active

053134974

ABSTRACT:
A method of detecting a disturbing signal for demodulating digital data, wherein, on the modulated signal transposed into baseband, the disturbing signal is detected by periodically inserting known signals by means of a fixed guard time delay ((R+I)T.sub.s) applied to the received signal prior to demodulation, and wherein said method includes: a step of estimating the square of the modulus of the cross-correlation of the received referenced signal and of the expected signal at a determined instant when the reference signal is assumed to be present; a step of estimating the square of the correlation of the received signal at the same instant, of multiplying by a coefficient which represents the square of the threshold for the estimated correlation coefficient, and of multiplying by the number of reference symbols used in a reference burst; and a step of comparing with each other the two quantities obtained simultaneously during the preceding two steps. The invention also relates to apparatus for implementing the method. The invention is particularly applicable to digital radio beams.

REFERENCES:
patent: 4100531 (1978-07-01), Kobayashi et al.
patent: 4370740 (1983-01-01), Levy et al.
patent: 4380082 (1983-04-01), Namiki
patent: 4799025 (1989-01-01), Le Quean
patent: 4984253 (1991-01-01), Trout
patent: 5153527 (1992-10-01), Yaguchi

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